Add support for streaming and fixes few issues (see description) (#202)

e2e_tests/common_scripts.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+log() {
+  timestamp=$(date +"%Y-%m-%d %H:%M:%S")
+  message="$*"
+  echo "$timestamp: $message"
+}
+
+wait_for_healthz() {
+  local healthz_url="$1"
+  local timeout_seconds="${2:-30}"  # Default timeout of 30 seconds
+  local sleep_between="${3:-5}"  # Default sleep of 5 seconds
+
+  local start_time=$(date +%s)
+
+  while true; do
+    local response_code=$(curl -s -o /dev/null -w "%{http_code}" "$healthz_url")
+
+    log "Healthz endpoint $healthz_url response code: $response_code"
+    if [[ "$response_code" -eq 200 ]]; then
+      log "Healthz endpoint is healthy. Proceeding..."
+      return 0
+    fi
+
+    local elapsed_time=$(( $(date +%s) - $start_time ))
+    if [[ $elapsed_time -ge $timeout_seconds ]]; then
+      log "Timeout reached. Healthz endpoint is still unhealthy. Exiting..."
+      return 1
+    fi
+
+    sleep $sleep_between
+  done
+}